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x-(90-x)=10
We move all terms to the left:
x-(90-x)-(10)=0
We add all the numbers together, and all the variables
x-(-1x+90)-10=0
We get rid of parentheses
x+1x-90-10=0
We add all the numbers together, and all the variables
2x-100=0
We move all terms containing x to the left, all other terms to the right
2x=100
x=100/2
x=50
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